[PSUBS-MAILIST] Hatch Closure Mechanism

[Alan via Personal_Submersibles]

Thanks Hank,
will have to think on this one. I want to let a novice dive my sub, so
the system needs to be bullet proof.
If I have some sort of lock mechanism I would need to be able to bypass
it if I needed to escape at depth. The pressure at depth would be apposing 
the manual operation of the overpressure valve. You could flood the sub first
but normally the hatch is un-dogged prior to the hull equalizing.
Cheers Alan



Sent from my iPad

> On 31/12/2017, at 1:49 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> You could have a lock that prevents the hatch mechanism from opening that is activated by turning the hatch vent.  I always vent before I one the hatch anyways.
> Hank
> 
> On Friday, December 29, 2017, 11:09:03 PM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Just doing some evening reading of the GL rules & noticed this rule about hatches....
> "the closing mechanism is to be designed in such a way that opening of
> the hatch is only possible after pressure equalisation" 
> I am wondering what options there are for achieving this.
> Has anyone had experience of the hatch opening with explosive force due
> to internal over-pressure not being equalised.
> Alan 
> 
> Sent from my iPad
> 
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